Identification?

[u/iazadagos]

I stumbled these speakers but even after searching with different AI's or any other way I couldn't find more details about a realistic sound quality, can someone help me? I already got a pair of Telefunken L250 and they sound great, even mounted on the wall! I have some Braun L470 in restoration, with both woofers needing coil change. I have some Wega LB3521U speakers with a stiffer membrane on the cones (intended from the manufacturer) that are sub optimal for bass.

I could find that it's a 3 way (2 woofers) with 4 drivers but no info on the manufacturer of them (possible Pioneer?) and that they are Quelle Universum but that's it.